ILX Lightwave LDC-3700C Series, User Manual, Page: 162 / 176

C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Calibration Overview
146
LDC-3700C Series
C H A P T E R
5

Laser Forward Voltage Measurement Calibration
The following procedure is for calibrating the LASER voltage measurement.
Configure the Controller in the following manner for the Laser Controller Voltage
calibration:
1 With the LASER output off, connect a calibrated voltmeter, in parallel with a resistor
(100

, 2 Watt for the LDC-3714C; 15

, 5 Watt for the LDC-3724C or LDC-3744C), to the
LASER output (Laser Anode and Laser Cathode) on the rear panel of the controller.
2 Press the ( LASER MODE ) ON switch to turn the LASER output on The LASER output
must be on in order to enter the LDV calibration mode.
3 Enter the LASER V calibration mode by pushing the ( Communications ) LOCAL and
( LASER DISPLAY ) V switches at the same time. The TEC display will blank and the
controller will drive the LASER current output to the respective set point and the LASER
display will indicate forward voltage in Volts.
4 Enter the measured voltage (in volts). Press and hold in the ( PARAMETER ) SET switch
and turn the ADJUST knob until the LASER display indicates the measured voltage.
5 Once the actual voltage value is entered, the Controller will set the current to
approximately one-fourth (1/4) of the original value. It will then expect the second
calibration voltage point.
6 Input the second actual (measured) LASER forward voltage.
7 Once the second actual voltage value is entered, the Controller stores the new calibration
constants.
Function State
Laser Mode I (constant current low bandwidth)
Range
LDC-3714C
LDC-3724C
LDC-3744C
100 mA
500 mA
2000 mA
Laser Limit set to FS (full scale of range)
I Set Point
LDC-3714C
LDC-3724C
LDC-3744C
60 mA
400 mA
400 mA